Malicious PDF — malware analysis report

Static analysis result for SHA-256 55c8a31fd2f4a419…

MALICIOUS

PDF

96.2 KB Created: 2021-06-30 22:41:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1c08129fc66ba9af1412f39a60d8a865 SHA-1: 522ebbc39edcb9839dc2032eed5ee4ce704ce7bd SHA-256: 55c8a31fd2f4a419f3a45d8bb5b8719a00f4497f3cd19b096b2aca687e0a5e97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a common phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://queure.ru/uplcv?utm_term=codes+in+noodle+arms
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/dfc14bdc90768192d6d672072a0e4f2e/lubemite.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cefb4c0986---zifutowarufu.pdf
    • http://ersatzmonitor.de/userfiles/file/xilelunudakobed.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160bb045a5a833---87277137430.pdf
    • https://etimes.mn/uploads/files/zizexilob.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/178bdc37c75ff18de773b5006d8ded86/85228531101.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f16ecce70---sologa.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c56854b240---59225491932.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/92ce100ddac621c4723aef13d55e1249/nituwekij.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc5388db0b.pdf
    • http://74ahs.com/clients/2/2a/2a132ee8da0778863662fd4b1fa251ed/File/denig.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a64ca40ffe3---76530083769.pdf
    • https://sieuthimayphat.com/ckfinder/userfiles/files/lixoxumaxoluretererotex.pdf
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/84458034292.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/eef02accac14f1ad406af0926591d944/55202704843.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853758b854d---59406963257.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/092aa12f985e10d6ffb5ff1fcc1ce497/87142003596.pdf
    • http://ruegen-ferienhaus-schneider.de/userfiles/file/pobefusutox.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/16096385fe45cd---24248907070.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/9bf9f4bcd06be8a6916460b00d6bb0a4/liregiginagi.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4d29cab18---kusanelobowaserik.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d60e531e5ec---32599321160.pdf
    • http://alexlunacoach.com/img/editor/file/gofafomedewipapuvapimo.pdf
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca157199b2---vasadefaxeramofewiz.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3b7.bin
973e4366acbd4d760fc658275cd5cee24f5ac4c7e7534a4bdb1258eec8350830		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B7 19792 bytes
font_01_sfnt_off000128e6.bin
d8d5407f7314ed99705481f48a3ee83f3d648571a57a982116f309baf90813f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128E6 10340 bytes
font_02_sfnt_off00014023.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14023 16792 bytes
font_03_sfnt_off00015834.bin
c769da4fa701dc856d2b73579d3f9841ce28296003560c59fc424950d7ddad47		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15834 18180 bytes

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